Well, and practical for what needs? City/terrain? Are you tall or petite? What exactly is the budget (so I know what you mean by affordable?
Also, I am not quite sure what you mean by 2in1 as different people mean different things. If by 2in1 you mean a pram-pushchair with a convertible carrycot-to-seat - check the Kinderkraft XMOOV which is budget-friendly and also all-terrain. They also have the [kinderkraft-juli|Juli]] which is simpler, more urban - for more smooth pavements.
If by 2in1 you mean a system with a carrycot and a seat, I would look at Joie strollers. They are affordable enough while nice in quality for that price. From the Litetrax line to the Versatrax, I think you will find multiple nice options depending on your budget and requirements.
And lastly, if you mean a 2in1 travel system = with a car seat and a seat, look at the Valco Ultra Trend which is reversible, can be used without a carrycot, and offers car seat adapters. Then check the lighter, forward-facing models like Valco Snap, Joie Litetrax or Britax B-Agile M. They are simpler but will last you, and a car seat can be attached to all of them.
Think about the choices I talked about here, visit a baby shop to check what's available and how much it costs where you live, and if you think of more requirements and details, be sure to ask again-